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Debt - Long-Term Debt (Parenthetical) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Mar. 05, 2018 | Mar. 31, 2016
2018 Credit Agreement |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount available under credit facility |  |  | $ 350,000,000 |
2018 Credit Agreement | 2018 Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on term loan | 1.50% |  |  |
Term loan combined interest rate | 1.75% | 3.44% |  |
Maturity period | Mar. 31, 2023 |  |  |
2018 Credit Agreement | Revolving Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity period | Mar. 31, 2023 |  |  |
Amount available under credit facility | $ 200,000,000 |  | $ 200,000,000 |
Senior Convertible Notes 2016 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity period | Mar. 15, 2036 |  |  |
Interest rate on senior subordinated convertible notes | 4.25% |  |  | 4.25%

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- Definition The average effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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